Quiet-Sun Mg ii h and k Line Profiles Derived from IRIS Full-Sun Mosaics. I. Reference Profiles and Center-to-limb Variation

0548010 - ASÚ 2022 RIV US eng J - Článek v odborném periodiku
Gunár, Stanislav - Koza, J. - Schwartz, P. - Heinzel, Petr - Liu, Wenjuan
Quiet-Sun Mg ii h and k Line Profiles Derived from IRIS Full-Sun Mosaics. I. Reference Profiles and Center-to-limb Variation.
Astrophysical Journal Supplement Series. Roč. 255, č. 1 (2021), č. článku 16. ISSN 0067-0049. E-ISSN 1538-4365
Grant CEP: GA ČR GA19-16890S; GA ČR(CZ) GA19-17102S; GA ČR(CZ) GA19-20632S
Institucionální podpora: RVO:67985815
Klíčová slova: solar ultraviolet emission * solar atmosphere * limb darkening
Obor OECD: Astronomy (including astrophysics,space science)
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4365/ac07ab

We derived high-precision reference profiles of the Mg ii h and k lines that represent the quiet Sun during a minimum of the solar activity. To do so, we used the broad catalog of full-Sun mosaics obtained by the Interface Region Imaging Spectrograph (IRIS). To minimize the influence of the local variations due to the on-disk solar features and to achieve low levels of uncertainties, we used 12 IRIS full-Sun mosaics without sunspots or other significant signs of solar activity. These mosaics were obtained between 2019 April and 2020 September in the near-ultraviolet spectral range. In this paper, we present the disk-averaged reference profiles of Mg ii h and Mg ii k lines, together with a series of reference profiles spanning the distance between the disk center and the solar limb. These series of profiles offer a detailed representation of the center-to-limb variation of both Mg ii h and Mg ii k lines. The reference Mg ii h and k line profiles provided in this paper can be used as the incident radiation boundary condition for radiative-transfer modeling of prominences, spicules, and other coronal and chromospheric structures.
Trvalý link: http://hdl.handle.net/11104/0324140